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Tests that new page load calls NavigationItemsPruned callback if there
were forward navigation items.

Bug: 910894
Change-Id: I98bfd1a9960b99d0d7d8511b2b4068f56344b8d1
Reviewed-on: https://chromium-review.googlesource.com/c/1357841Reviewed-by: Danyao Wang <danyao@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613171}